Polymarket vs. Kalshi
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See where the two biggest prediction markets disagree. Pick any two markets, or start from the biggest gaps below: prices, volume, history and the resolution rules, side by side.
Next White House Press Secretary announced by December 31, 2026?
Vol $17.5K today · $80K total
Will Scott Jennings be the next White House Press Secretary before Jan 20, 2029?
Vol $45.3K today · $153.2K total
Polymarket is 67 points higher than Kalshi (82% vs 15%). Kalshi trades about 2.6× more volume today, so its price has more money behind it. They resolve on different dates (Jan 1 vs Jan 27), so they may not be exactly the same bet.
History starts when we first saw each market, so a newly added market has a short line.
| Polymarket | Kalshi | |
|---|---|---|
| Probability (Yes) | 82% | 15% |
| Change (24h) | -1.0 pt | -4.0 pt |
| Volume today | $17.5K | $45.3K |
| Total volume | $80K | $153.2K |
| Liquidity | $219K | — |
| Open interest | — | $121.5K |
| Resolves | 74d | 28mo |
| Tracked for | 2 days | 2 days |
Resolution rules: read both before trusting a gap
Polymarket
This market will resolve to "Yes" if Donald Trump or the Trump administration announces a new White House Press Secretary to replace Katie Zacharia between market creation and the specified date, 11:59 PM ET. Otherwise, this market will resolve to "No". An individual announced as an acting or interim Press Secretary will not qualify toward this market's resolution. Any qualifying announcement made within this market's time frame will count, regardless of when the new Press Secretary is sworn in or begins serving. This market's primary resolution source will be official information from the Trump administration; however, a consensus of credible reporting may also be used.
Kalshi
If Scott Jennings formally holds the position of White House Press Secretary before Jan 20, 2029, and is the first such subject to do so after Issuance, then the market resolves to Yes.
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Informational only — not financial advice. Odds are mirrored from each platform and may lag the live order book.